...well FO2238 currently is the only game I am playing...
Same here, not playing any other online games at the moment.I really love what has been done with the game so far. It stays true to the original while adding in new elements to create and support an economy as well as many other features that propel MMORPGs.
The way gathering and crafting works, professions, tents and bank accounts, being able to hire mercs or become a slaver and enslave and sell NPCs, being able to create/join factions and make a plethora of different bases... Guarded and unguarded cities and mines, full loot and the constant danger of getting gunned down and robbed, or pickpocketed... Using radios to talk and send distress signals, being able to steal a players radio and spy on faction or group communication...and much more...
Honestly all of this combined makes the game feel like Ultima Online to me. UO is one of my favorite MMOs to date, I still play on a particular shard from time to time, and nobody has been able to make a game with that same feeling...
(Except maybe Darkfall I guess but it still didn't feel right.) So for me it's like
FOnline 2238 = Fallout + Ultima Online - and that's why I enjoy it so much...